Fix Redis#id inside pipeline blocks.

Closes #383.

Author: djanowski

lib/redis.rb

@@ -2415,15 +2415,11 @@ def sscan_each(key, options={}, &block)
   end
 
   def id
-    synchronize do |client|
-      client.id
-    end
+    @original_client.id
   end
 
   def inspect
-    synchronize do |client|
-      "#<Redis client v#{Redis::VERSION} for #{@original_client.id}>"
-    end
+    "#<Redis client v#{Redis::VERSION} for #{id}>"
   end
 
   def method_missing(command, *args)

test/internals_test.rb

@@ -109,6 +109,17 @@ def test_timeout
     end
   end
 
+  def test_id_inside_multi
+    redis = Redis.new(OPTIONS)
+    id = nil
+
+    redis.multi do
+      id = redis.id
+    end
+
+    assert_equal id, "redis://127.0.0.1:6381/15"
+  end
+
   driver(:ruby) do
     def test_tcp_keepalive
       keepalive = {:time => 20, :intvl => 10, :probes => 5}